Light guide plate and backlight module and display module using the same

Abstract

A light guide plate includes a plate body and a supporting unit. The plate body has a light-exiting face and a lateral side, wherein the supporting unit is disposed along the lateral side. The supporting unit has a top surface and an outer lateral surface, the top surface is above the light-exiting face, the lateral surface protrudes from an end surface of the lateral side of the plate body, wherein a portion of the end surface away from the light-exiting face is exposed to form a recess. A backlight module includes the light guide plate mentioned above and a back plate having the light guide plate disposed thereon. A periphery of the back plate has a side wall formed thereon and extending into the recess. A display device includes the above light guide plate and a display panel.

What is claimed is: 
     
       1. A light guide plate, comprising:
 a plate body having a light-exiting face and a lateral side; 
 a supporting unit disposed along the lateral side; 
 wherein the supporting unit has a top surface, a bottom surface opposite to the top surface, an outer side surface and an inner side surface opposite to the outer side surface, the top surface is above the light-exiting face, the outer side surface protrudes from an end surface of the lateral side and exposes a portion of the end surface away from the light-exiting face to form a recess opposite to a side of the plate body having the light-exiting face; 
 wherein the bottom surface and the exposed portion of the end surface connect at a first boundary, the inner side surface and the light-exiting face connect at a second boundary, a virtual plane defined by the first boundary and the second boundary forms an included angle, the included angle equal to or less than 60 degrees with the light-exiting face. 
 
     
     
       2. The light guide plate of  claim 1 , wherein the outer side surface protrudes from the end surface by a distance, the distance is less than a width of the top surface in the same direction. 
     
     
       3. The light guide plate of  claim 2 , wherein the width is equal to or larger than 0.4mm. 
     
     
       4. The light guide plate of  claim 1 , wherein a height of the exposed portion of the end surface is equal to or less than a thickness of the plate body. 
     
     
       5. The light guide plate of  claim 1 , wherein the included angle is equal to or less than 45 degrees. 
     
     
       6. The light guide plate of  claim 1 , wherein the supporting unit covers an edge located between the light-exiting face and the lateral side. 
     
     
       7. A backlight module, including:
 a light guide plate of  claim 1 ; and 
 a back plate having an end bent to form a side wall, wherein the light guide plate is disposed on the back plate, the side wall extends into the recess. 
 
     
     
       8. The backlight module of  claim 7 , wherein a height of the exposed portion of the end surface is equal to or smaller than a height of the side wall. 
     
     
       9. The backlight module of  claim 8 , wherein the height of the side wall is greater than or equal to triple a thickness of the back plate. 
     
     
       10. The backlight module of  claim 7 , wherein a distance by which the outer side surface protrudes from the end surface is equal to or larger than a thickness of the back plate. 
     
     
       11. The backlight module of  claim 7 , wherein the supporting unit has a bottom surface opposite to the top surface, the side wall supports the bottom surface. 
     
     
       12. A display device, comprising:
 a light guide plate of  claim 1 ; and 
 a display panel disposed on the light guide plate and supported by the top surface. 
 
     
     
       13. The display device of  claim 12 , wherein the included angel is equal to or less than 45 degrees.